I have answer to this! I have had this problem like 3 months now and i finally fixed it. Basically what i did was that i bought a broken nexus 5 (only the screen glass was broken) and tried to swap every part one by one. The one that was not working was the main dock! It is a cheap fix, like 10£ on Ebay. I am writing this post because anyone else haven't. I hope that someone sees this. I now copy this message to all other threads so people can fix their nexus 5's :) PS:as you can probably tell English isn't my first language.